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利用已持续运行2年的石英砂滤柱中试系统,通过改变进水中离子的种类及其浓度,考察了不同高浓度离子对石英砂滤料表面活性铁锰氧化物滤膜催化氧化水中氨氮性能的影响。结果表明:高浓度钠离子、钾离子、氯离子、硫酸根离子、碳酸氢根离子对滤料去除氨氮性能基本没有影响,去除率均达到了87%以上。高浓度钙离子对滤料去除氨氮性能影响很大,当进水氯化钙浓度为1 000 mg/L时,去除率降低到了51%。停止投加钙离子后,滤料去除氨氮的性能可在8~9h内恢复。对滤料表面进行微观表征后发现钙的含量大幅上升,降低了滤料的比表面积、孔体积,影响了滤料与氨氮污染物的接触,造成对氨氮去除率的下降。
Using the quartz sand filter pilot system which has been operating continuously for 2 years, by changing the type and concentration of ions in the influent water, the effects of different concentrations of ions on the surface activity of the ferromanganese oxide membrane on the quartz sand filter were investigated. The impact of performance. The results showed that high concentration of sodium, potassium, chloride, sulfate and bicarbonate ions had no effect on the removal of ammonia nitrogen by the filter media, and the removal rates reached above 87%. High concentrations of calcium ions have a significant effect on the removal of ammonia nitrogen from the filter media. When the influent calcium chloride concentration is 1 000 mg / L, the removal rate is reduced to 51%. Stop adding calcium ions, the filter to remove ammonia nitrogen performance can be restored within 8 ~ 9h. The microscopic characterization of the filter media found that the content of calcium increased significantly, reducing the specific surface area and pore volume of the filter media, affecting the contact between the filter media and ammonia nitrogen pollutants, resulting in the decrease of ammonia nitrogen removal rate.